High tension electrical device



Feb. 19, 1935. AU 1,991,879

HIGH TENSION ELECTRICAL DEVICE Filed July 24, 1928" nmtmwmvxmucmuwmwkumx Amlmm'xn mnkiA INVENTOR ATTORNEY underground cables.

Patented Feb. 19, 1935 UNITED STATES PATENT OFFICE HIGH TENSION ELECTRICAL DEVICE Application July 24, 1928, Serial No. 295,008

3 Claims.

My invention relates to coverings for high tension electrical conductors and among its many useful embodiments are tank constructions for oil switches and transformers and coverings for trating my invention I have shown it embodied as an oil switch tank, from a description of which its more general utility will be appreciated.

Strength being one of the prime requirements of enclosures of this sort, it has been customary to make them of steel and the insulation for the electrical terminals has been obtained by the use of bushings of sufficient insulating capacity for the purpose. In embodiments of my invention the entire enclosure serves as an insulator and the need for the large bushings of high insulating capacity is thereby obviated.

In accordance with my invention the enclosure is made of reinforced insulating material. For example it may be molded of a suitable insulating composition or, if a tank, it may be made of wooden staves. The reinforcement may be molded into the composition or, if a wooden tank be used, it may be reinforced by bands or hoops. If the reinforcement be of metal, it is essential that they be disposed circumferentially so as not to impair the insulative character of the covering.

I shall now describe the illustrated embodiments of my invention and shall thereafter point out my invention in claims.

Fig. 1 is a longitudinal section of a reinforced enclosure for an electricalswitch which may be utilized as an oil switch;

Fig. 2 is an elevation of a combined oil switch and transformer embodying my invention in a modified form;

Fig. 3 is a central vertical section of the same.

The switch elements shown in Figure 1 are of a construction which, per se, constitute the subject-matter of my Patent No. 1,895,907, issued January 31, 1932. Two contact rods land 2 slide in opposite ends of the cylindrical tank 3. These contact rods will have electrical connection with the line terminals, and contact with their inner ends to close the circuit. The contact rods are connected to pistons 4 and 5 which slide in cylinders 6 and 7 and are operated by springs 8 and 9 to open the switch and by fluid pressure means, such as compressed air, to close the switch. Latching means (not shown) hold the switch members closed, the release being effected by any suitable manual or automatic control.

The tank 3, which may, if desired, be filled with oil, has heads 10 and 11 of porcelain or other For the purpose of illus insulating material which serve as bushings for the cylinders 6 and '7. The body of the tank is of reinforced insulating material.

In the form shown the tank body is molded of a suitable insulating composition and the rein- 5 forcement consists of bands 12, preferably of metal, which are molded into the body. These reinforcing bands are spaced and are disposed circumferentially so that each band is throughout in substantially a unifrom potential zone.

In the form shown in Figures 2 and 3 the tank is composed of wooden staves 13 reinforced by spaced metal hoops 14 which may be of T-shapc in cross section. The heads 15 of the tank may be of metal. Specifically the internal mechanism 15 is a combined circuit breaker and transformer which forms the subject-matter of my Patent No. 1,925,861, issued September 5, 1933. The tank internally is divided by a partition 16 into two compartments, the upper being much smaller than the the lower. A transformer 17 is disposed in the lower compartment and has a high tension winding 22, and a low-tension winding 23 having terminals 26 and 2'7 extending through the tank. One terminal 25 of the high-tension winding 22 is led through the partition 16 to a rotative contact member 18 rotatively supported from the top of the housing as disclosed in Fig. 3. Any hand machine or automatic device may be used to rotate rod 18 out of contact with rod 19. The other member of the circuit breaker is a sliding contact rod 19 which forms one line terminal and enters the switch chamber through a bushing 20 is the side wall. Suitable actuating means 21 such as a chamber connected, as desired, to a source of compressed air for the sliding rod 19 are provided external of the tank, and other means (not shown) will be provided for rotating the contact member 18 in synchronism with the actuation of the cooperative contact rod 19. The 40 other terminal 24 of the high-tension winding is connected to the metal lower end 15 of the tank which forms the other line material.

It will be understood that my invention is in no wise limited to the specific embodiments illustrated and above described, but that various modifications may be made in those forms without departing from the scope of my invention as defined in the following claims.

I claim:

1. An oil switch for high tension lines comprising an oil-containing tank made of insulating material and surrounded at spaced intervals by reinforcing bands, a device within the tank, an insulative bushing in the wall of the tank, and a line terminal entering the tank through the bushing and adapted to be connected to and disconnected from said device at a point within the tank, and a second terminal of said device at a remote portion of the wall of said tank from said bushing.

2. An oil containing tank composed of reeni'orced insulating material, an electrical device within the tank, a pair 01 line terminals for said device. one of said terminals passing through the wall 0! said tank adjacent one end and the other terminal being adjacent the other end thereof and means for individually supporting and actuating said line terminal passing through the tank to connect the electrical device to a' power line.

3. An oil-containing tank composed of insulating material, spaced circumferential reenforcing bands about the tank, an electrical device within the tank, an insulating bushing in the wall of the tank adjacent one end thereof, a line terminal leading through the bushing and connectable with the electrical device, means for actuating trical device adjacent the other end of said tank.

FRANK G. BAUM. 

